Using Alternatives to Determine the Shallowest Depth for Bathymetric Charting: Case Study

Tannaz H. Mohammadloo, Mirjam Snellen, Dick G. Simons, Ben Dierikx, Simon Bicknese

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)
72 Downloads (Pure)


Methods for gridding multibeam echo sounder (MBES) measurements to equidistant grids are proposed as alternatives to the shallowest measured depth, which is affected by outliers. The approaches considered use a combination of mean and standard deviation of soundings and the regression coefficient from the best fitted plane. These methods along with mean and shallowest depths were applied to two surveyed areas. Two issues were found to be of importance, that is, a proper distribution of soundings and low uncertainties in the depth measurements. Improper sampling excludes using the method employing regression coefficients. For flat areas, the shallowest measured depth was found to be highly influenced by measurement uncertainties, counteracted when using the mean depth. However, the mean depth underestimates the shallowest depth for areas with slopes. When correcting the mean depth for standard deviation, the effect of slopes is accounted for while the influence of measurement uncertainties is decreased compared to shallowest measured depth. Since the uncertainties are dependent on beam angle, depth, and measurement equipment, these issues need to be accounted for in survey planning.

Original languageEnglish
Article number05019004
Number of pages15
JournalJournal of Surveying Engineering
Issue number4
Publication statusPublished - 1 Nov 2019


  • Bathymetry gridding
  • Mean depth
  • Regression coefficients
  • Shallowest depth
  • Standard deviation of depth measurements

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